XMM-Newton detects a relativistically broadened Iron Line in SAX J1808.4-3658 spectrum.

Astronomy and Astrophysics – Astronomy

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X-Ray, Binaries, Neutron Stars, Pulsars

Scientific paper

The Accreting Millisecond Pulsar SAX J1808.4-3658 (P=2.49 ms) was observed by XMM Newton for 60 ks on 2008 October 1 (Start Time=MJD 54739.99517), during the outburst which began on 2008 September 21 (ATEL #1728). To model the continuum emission we used data acquired by EPIC PN (timing mode) and RGS1-2, which observed 600c/s and 40c/s respectively from the source. The absorbed 0.3-10 keV continuum emission is well fitted by a model composed by a multitemperature disc blackbody, a blackbody and a power law, but the addition of a relativistically broadened emission line at 6.5 keV is strongly required by the data.

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